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Permissible Variations in Outside Diameter <br /> Outside Diameter at any point shall not vary from standard specified more than: <br /> For NPS 1 1/2 and For NPS 2 and Larger <br /> Smaller Sizes Sizes <br /> 1/64" 1/32" under 1% over 1%under <br /> Tensile Requirements <br /> Seamless and Electric-resistance-welded Continuous-Welded <br /> Grade A Grade B <br /> Tensile Strength, min., 48,000 60,000 45,000 <br /> psi <br /> Yield Strength, min., psi 30,000 35,000 25,000 <br /> Number of Tests Required <br /> Seamless and Electric-Resistance-Welded -- Bending, flattening, tensile on one length of pipe from each lot of 500 lengths or less of <br /> a size. Continuous-Weld -- Bending, flattening, tensile <br /> NPS 1 1/2 & smaller NPS 2 & larger <br /> one / 25 tons one /50 tons <br />